How can an open redirection vulnerability be exploited?

How can an open redirection vulnerability be exploited?

Since the domain name in a URL is typically the only indicator for a user to recognize a legitimate website from a non-legitimate one, an attacker can abuse this trust to exploit an open redirect vulnerability on the vulnerable website, and redirect the user to a malicious page to execute further attacks, as explained in the following sections.

Are there any open redirection vulnerabilities in netsparker.com?

Netsparker detects a variety of open redirection vulnerabilities, including DOM-based open redirects that can lead to cross-site scripting, so it’s a good idea to regularly scan your websites and applications to identify such weaknesses.

How is open redirection vulnerability used in phishing?

By exploiting the open redirect vulnerability on the legitimate website, the attacker is redirecting the victim to, http://attacker.com/phish which is a phishing page that is similar to the legit website.

What can an attacker do with a redirection URL?

An attacker can construct a URL within the application that causes a redirection to an arbitrary external domain. This behavior can be leveraged to facilitate phishing attacks against users of the application.

How to prevent vulnerable open redirects and forwards?

The easiest and most effective way to prevent vulnerable open redirects would be to not let the user control where your page redirects them to. If you have to redirect the user based on URLs, instead of using untrusted input you should always use an ID which is internally resolved to the respective URL.

How to avoid open redirect issue in Java?

If user input can’t be avoided, ensure that the supplied value is valid, appropriate for the application, and is authorized for the user. It is recommended that any such destination input be mapped to a value, rather than the actual URL or portion of the URL, and that server side code translate this value to the target URL.

Can a Java Servlet redirect to a malicious site?

The servlet will retrieve the url parameter value from the request and send a response to redirect the browser to the url address. The problem with this Java servlet code is that an attacker could use the RedirectServlet as part of a e-mail phishing scam to redirect users to a malicious site.

How to redirect to an untrusted site in Java?

The user sees the link pointing to the original trusted site (example.com) and does not realize the redirection that could take place. The following code is a Java servlet that will receive a GET request with a url parameter in the request to redirect the browser to the address specified in the url parameter.

How to redirect post body to final url?

The HTTP 307 will redirect the POST body and the headers to the final URL that needs to be targeted thereby completing the attack. To setup a successful PoC let’s take a look at our vulnerable endpoint and its requirements:

Which is the best definition of open redirection?

An Open Redirection is when a web application or server uses an unvalidated user-submitted link to redirect the user to a given website or page. Even though it seems like a harmless action to let a user decide to which page he wants to be redirected,…